Coinbase Customer Data Hit in Analytics Vendor Breach, Funds ‘Not Impacted’

Coinbase has said a security incident at Amplitude, a third-party analytics provider, affected contact data belonging to a "small subset" of its customers, while stressing that the exchange itself had not been breached.

"Coinbase has not had a data breach," the company's support account said in a tweet on Tuesday night. "Amplitude, an analytics vendor, experienced a security incident which impacted a small subset of Coinbase customer contact data, among other Amplitude customers."

Coinbase said it had found no evidence of unauthorized access to its systems and that customer funds were "not impacted." It is notifying affected customers and regulators in line with its legal obligations.

The company did not say how many customers were affected, what kinds of contact data were exposed, or when the incident took place. Nor did it name the other Amplitude customers affected.

Coinbase's 2025 breach

Coinbase disclosed a far more serious incident in May 2025, when it said cybercriminals had bribed overseas customer support agents to steal personal data belonging to less than 1% of its monthly transacting users. The exchange refused a $20 million ransom demand and instead offered a $20 million bounty for information leading to the attackers' arrest.

A later filing with the Maine attorney general put the number of affected customers at 69,461, with data including names, addresses, masked Social Security numbers and government ID images exposed.

Crypto firms have repeatedly seen customer data exposed through partners. In September, hardware wallet maker Trezor said a breach at shipping provider ShipMonk had exposed the names, phone numbers and home addresses of 67,000 U.S. customers, on top of nearly 14,000 it had disclosed in August. Some of the records dated back to 2019, years after ShipMonk had told Trezor they were deleted. Trezor warned affected customers to watch for fake emails, calls and letters, and about risks to their physical security.

At the time, cybercrime consultant David Sehyeon Baek told Decrypt that a letter carrying a name and home address signals "we can locate you," and that stolen data stays useful for years because people rarely move or change their numbers.